US8804589B2 - Adaptive awake window - Google Patents

Adaptive awake window Download PDF

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Publication number
US8804589B2
US8804589B2 US13/273,921 US201113273921A US8804589B2 US 8804589 B2 US8804589 B2 US 8804589B2 US 201113273921 A US201113273921 A US 201113273921A US 8804589 B2 US8804589 B2 US 8804589B2
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criterion
information
wireless channel
network
wireless
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US20130094413A1 (en
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Markku Tapio Turunen
Kari J. Leppänen
Philip Ginzboorg
Enrico-Henrik RANTALA
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RPX Corp
Nokia USA Inc
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Nokia Oyj
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Priority to EP12183977.3A priority patent/EP2582188B1/de
Priority to CN201210387491.0A priority patent/CN103052091B/zh
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
    • H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • Embodiments of the present invention pertain to wireless communication, and in particular, to enabling the wireless conveyance of communal information between apparatuses.
  • Wireless technology has evolved from a simple carrier for voice communication to being employed in various wireless applications. Enhancements in wireless technology have substantially improved communication abilities, quality of service (QoS), speed, etc., which have contributed to insatiable user desire for new device functionality. As a result, portable wireless apparatuses are no longer just relied on for making telephone calls. They have become integral, and in some cases essential, tools for managing the professional and/or personal lives of users.
  • QoS quality of service
  • wireless support may enable monitoring (e.g., sensor) apparatuses to transmit data to other apparatuses via wireless communication.
  • Example usage scenarios may include natural resource monitoring, biometric sensors, systems for supporting financial transactions, personal communication and/or location devices, etc. Apparatuses enabled for such monitoring/communication activities may operate using limited resources. For example, these apparatuses may be simple (e.g., may have limited processing resources), may be small (e.g., may have space constraints due to size limitations imposed in retrofit applications), may have power constraints (e.g., battery powered), etc.
  • Wireless connection establishment and maintenance processes defined in existing communication protocols may not be appropriate for all apparatuses, such as those with resource constraints as described above.
  • existing wireless communication protocols may require substantial wireless interaction to keep apparatuses synchronized with other apparatuses in the network, wherein such interaction may comprise either continuous or periodic network participation.
  • These requirements may not take into consideration the burden that such extensive network communication places upon resource-constrained devices, especially when other wireless traffic could possibly cause interference in the same operational space (e.g., other wireless networks operating utilizing the same wireless channel). As a result, it may become difficult to operate such resource-constrained apparatuses in accordance with these standards.
  • Example embodiments of the present invention may be directed to a method, apparatus, computer program and system for facilitating communal apparatus interaction.
  • an apparatus configured to communicate on a wireless channel may receive first information pertaining to wireless traffic expected from other networks also utilizing the wireless channel. The apparatus may then determine whether the received information satisfies a first criterion, and if it is determined that the first information satisfies the first criterion, the apparatus may shorten an “awake” window duration for communicating on the wireless channel.
  • the apparatus may proceed to further determine whether second information pertaining to wireless traffic on the wireless channel that is expected from a network satisfies a second criterion. If it is determined that the second information satisfies the second criterion, the apparatus may proceed to lengthen the awake window duration.
  • the first criterion may be set in the apparatus as a dominance threshold value for the other networks also utilizing the wireless channel
  • the second criterion may be set in the apparatus as a dominance threshold value for the network in which the apparatus is participating.
  • determining whether the first information satisfies the first criterion may comprise the apparatus determining whether the wireless traffic expected from the other networks also utilizing the wireless channel exceeds the other network dominance threshold.
  • the apparatus determining whether the second information satisfies the second criteria may comprise the apparatus determining whether the wireless traffic on the wireless channel expected from the network in which the apparatus is operating exceeds the dominance threshold value for the network in which the apparatus is participating.
  • first and second criteria correspond to previous values for the first and second information, respectively.
  • determining whether the first information satisfies the first criterion may comprise the apparatus determining whether the wireless traffic expected form the other networks also utilizing the wireless channel exceeds the previous wireless traffic expected from the other wireless networks also utilizing the wireless channel
  • determining whether the second information satisfies the second criterion may comprise the apparatus determining whether the wireless traffic expected from the network in which the apparatus is participating exceeds the previous wireless traffic expected from the network in which the apparatus is operating.
  • the results of these determinations may cause the apparatus to shorten or lengthen the awake window, which may correspond to a period of time during which the apparatus is allowed to transmit and receive on the wireless channel.
  • the apparatus may maintain (e.g., not shorten or lengthen) the duration of the awake window for communicating on the wireless channel.
  • FIG. 1A discloses example apparatuses, systems, configurations, etc. that may be utilized when implementing the various embodiments of the present invention
  • FIG. 1B discloses further detail regarding an example apparatus configuration that may be utilized when implementing the various embodiments of the present invention.
  • FIG. 2 discloses an example operational space comprising a plurality of apparatuses in accordance with at least one embodiment of the present invention.
  • FIG. 3 discloses examples of messaging that may occur in accordance with at least one example embodiment of the present invention.
  • FIG. 4 discloses an example of inter-apparatus message propagation in accordance with at least one example embodiment of the present invention.
  • FIG. 5 discloses an example of message activity in accordance with at least one example embodiment of the present invention.
  • FIG. 6 discloses a further example of the message activity disclosed in FIG. 5 in accordance with at least one embodiment of the present invention.
  • FIG. 7 discloses example awake period duration control in accordance with at least one example embodiment of the present invention.
  • FIG. 8 discloses further examples of awake period duration control in accordance with at least one example embodiment of the present invention.
  • FIG. 9A discloses an example simulation of performance that may be realized in accordance with at least one example embodiment of the present invention.
  • FIG. 9B discloses a second example simulation of performance that may be realized in accordance with at least one example embodiment of the present invention.
  • FIG. 9C discloses a third example simulation of performance that may be realized in accordance with at least one example embodiment of the present invention.
  • FIG. 10A discloses a flowchart for an example communication control process in accordance with at least one example embodiment of the present invention.
  • FIG. 10B discloses a second flowchart for an second example communication control process in accordance with at least one example embodiment of the present invention.
  • FIG. 1A An example of a system that is usable for implementing various embodiments of the present invention is disclosed in FIG. 1A .
  • the system comprises elements that may be included in, or omitted from, configurations depending, for example, on the requirements of a particular application, and therefore, is not intended to limit present invention in any manner.
  • Computing device 100 may be, for example, a laptop computer. Elements that represent basic example components comprising functional elements in computing device 100 are disclosed at 102 - 108 .
  • Processor 102 may include one or more devices configured to execute instructions. In at least one scenario, the execution of program code (e.g., groups of computer-executable instructions stored in a memory) by processor 102 may cause computing device 100 to perform processes including, for example, method steps that may result in data, events or other output activities.
  • Processor 102 may be a dedicated (e.g., monolithic) microprocessor device, or may be part of a composite device such as an ASIC, gate array, multi-chip module (MCM), etc.
  • Processor 102 may be electronically coupled to other functional components in computing device 100 via a wired or wireless bus.
  • processor 102 may access memory 104 in order to obtain stored information (e.g., program code, data, etc.) for use during processing.
  • Memory 104 may generally include removable or imbedded memories (e.g., non-transitory computer readable storage media) that operate in a static or dynamic mode. Further, memory 104 may include read only memories (ROM), random access memories (RAM), and rewritable memories such as Flash, EPROM, etc. Examples of removable storage media based on magnetic, electronic and/or optical technologies are shown at 100 I/O in FIG. 1 , and may serve, for instance, as a data input/output means. Code may include any interpreted or compiled computer language including computer-executable instructions. The code and/or data may be used to create software modules such as operating systems, communication utilities, user interfaces, more specialized program modules, etc.
  • One or more interfaces 106 may also be coupled to various components in computing device 100 . These interfaces may allow for inter-apparatus communication (e.g., a software or protocol interface), apparatus-to-apparatus communication (e.g., a wired or wireless communication interface) and even apparatus to user communication (e.g., a user interface). These interfaces allow components within computing device 100 , other apparatuses and users to interact with computing device 100 .
  • inter-apparatus communication e.g., a software or protocol interface
  • apparatus-to-apparatus communication e.g., a wired or wireless communication interface
  • apparatus to user communication e.g., a user interface
  • interfaces 106 may communicate machine-readable data, such as electronic, magnetic or optical signals embodied on a computer readable medium, or may translate the actions of users into activity that may be understood by computing device 100 (e.g., typing on a keyboard, speaking into the receiver of a cellular handset, touching an icon on a touch screen device, etc.). Interfaces 106 may further allow processor 102 and/or memory 104 to interact with other modules 108 .
  • other modules 108 may comprise one or more components supporting more specialized functionality provided by computing device 100 .
  • Computing device 100 may interact with other apparatuses via various networks as further shown in FIG. 1A .
  • hub 110 may provide wired and/or wireless support to devices such as computer 114 and server 116 .
  • Hub 110 may be further coupled to router 112 that allows devices on the local area network (LAN) to interact with devices on a wide area network (WAN, such as Internet 120 ).
  • LAN local area network
  • WAN wide area network
  • another router 130 may transmit information to, and receive information from, router 112 so that devices on each LAN may communicate.
  • all of the components depicted in this example configuration are not necessary for implementation of the present invention. For example, in the LAN serviced by router 130 no additional hub is needed since this functionality may be supported by the router.
  • interaction with remote devices may be supported by various providers of short and long range wireless communication 140 . These providers may use, for example, long range terrestrial-based cellular systems and satellite communication, and/or short-range wireless access points in order to provide a wireless connection to Internet 120 .
  • PDA personal digital assistant
  • cellular handset 144 may communicate with computing device 100 via an Internet connection provided by a provider of wireless communication 140 .
  • Similar functionality may be included in devices, such as laptop computer 146 , in the form of hardware and/or software resources configured to allow short and/or long range wireless communication.
  • some or all of the disclosed apparatuses may engage in direct interaction, such as in the short-range wireless interaction shown between laptop 146 and wireless-enabled apparatus 148 .
  • Example wireless enabled apparatuses 148 may range from more complex standalone wireless-enabled devices to peripheral devices for supporting functionality in apparatuses like laptop 146 .
  • interfaces 106 may include interfaces both for communicating data to computing apparatus 100 (e.g., as identified at 150 ) and other types of interfaces 170 including, for example, user interface 172 .
  • a representative group of apparatus-level interfaces is disclosed at 150 .
  • multiradio controller 152 may manage the interoperation of long range wireless interfaces 154 (e.g., cellular voice and data networks), short-range wireless interfaces 156 (e.g., Bluetooth and WLAN networks), close-proximity wireless interfaces 158 (e.g., for interactions where electronic, magnetic, electromagnetic and optical information scanners interpret machine-readable data), wired interfaces 160 (e.g., Ethernet), etc.
  • long range wireless interfaces 154 e.g., cellular voice and data networks
  • short-range wireless interfaces 156 e.g., Bluetooth and WLAN networks
  • close-proximity wireless interfaces 158 e.g., for interactions where electronic, magnetic, electromagnetic and optical information scanners interpret machine-readable data
  • wired interfaces 160 e.g., Ethernet
  • the example interfaces shown in FIG. 1B have been presented only for the sake of explanation herein, and thus, are not intended to limit the various embodiments of the present invention to utilization of any particular interface. Embodiments of the present invention may also utilize interfaces that are
  • Multiradio controller 152 may manage the operation of some or all of interfaces 154 - 160 . For example, multiradio controller 152 may prevent interfaces that could interfere with each other from operating at the same time by allocating specific time periods during which each interface is permitted to operate. Further, multiradio controller 152 may be able to process environmental information, such as sensed interference in the operational environment, to select an interface that will be more resilient to the interference. These multiradio control scenarios are not meant to encompass an exhaustive list of possible control functionality, but are merely given as examples of how multiradio controller 152 may interact with interfaces 154 - 160 in FIG. 1B .
  • FIG. 2 discloses an example operational space 200 that will be used to explain the various example embodiments of the present invention.
  • Operational spaces may be defined using different criteria. For example, physical areas like buildings, theatres, sports arenas, etc. may define a space where users may interact.
  • operational spaces may be defined in terms of apparatuses that utilize particular wireless transports, apparatuses that are within communication range (e.g., a certain distance) of each other, apparatuses that are members of certain classes or groups, etc.
  • Wireless-enabled apparatuses 202 are labeled “A” to “G” in FIG. 2 .
  • Apparatuses 202 may, for example, correspond to any of the wireless-enabled apparatuses that were disclosed in FIG. 1A , and may further comprise at least the hardware and/or software resources disclosed in regard to apparatus 100 in FIG. 1B . These apparatuses may further operate utilizing at least one common wireless communication protocol. That is, all of the apparatuses shown in FIG. 3 may interact wirelessly within operational space 200 (e.g., as members of wireless networks).
  • Example interaction between two apparatuses 300 and 302 is disclosed at 304 in FIG. 3 .
  • Example interaction 304 has been presented herein for explanation only.
  • the various embodiments of the present invention may accommodate wireless interaction between more than two apparatuses.
  • the apparatuses may have “upper-level” communication requirements that may comprise, for example, interactions by apparatus users and/or applications residing on the apparatuses that may trigger the transmission of messages that may be generally classified under the category of data-type communication 306 .
  • Data-type communication may be carried out via messages that may be wirelessly transmitted between apparatuses 300 and 302 .
  • Network establishment and media access control (MAC) management messages 308 may be utilized to establish and maintain an underlying wireless network architecture within operating space 200 that may be utilized to convey data-type communication messages 306 .
  • small messages e.g., having a mean size of 100 Bytes
  • MAC media access control
  • small messages e.g., having a mean size of 100 Bytes
  • Data-type communication messages 406 may then be conveyed using existing networks (new network connections do not need to be negotiated each time messages are sent), which may reduce response delay and increase quality of service (QoS).
  • the above maintenance of connectivity utilizing small messages may be considered as also maintaining apparatus awareness within operating space 200 as disclosed in FIGS. 2 and 4 .
  • small messages may be utilized to exchange not only apparatus-related information, but any information stored on an apparatus, such as apparatus user information, information about the physical location of an apparatus, etc.
  • This information may be referred to herein as “communal” information in that it relates to the operations of any of or all of the members of the “community” within distributed network 400 .
  • FIG. 4 An example of distributed local network formation 400 via automated network establishment and MAC management messages 308 is disclosed in FIG. 4 .
  • Apparatuses 202 entering into operational space 200 may immediately begin exchanging communal information (e.g., via small messages). The exchange of this information may occur without any prompting from, or even knowledge of, a user.
  • Example interactivity is shown in FIG. 4 , wherein various network establishment and MAC management messages 308 are exchanged between apparatuses A to G.
  • messages may be exchanged directly between an originating apparatus (e.g., the apparatus that is described by information elements contained in a message) and a receiving apparatus.
  • messages transmitted within network 400 may be forwarded from one apparatus 202 to another, thereby disseminating the information for multiple apparatuses 202 .
  • apparatuses 202 may be able to maintain real-time awareness of communal information (e.g., apparatuses, people, places objects, etc.) without having to manually orchestrate data collection.
  • communal information e.g., apparatuses, people, places objects, etc.
  • IP Internet Protocol
  • SNAP subnetwork access protocol
  • LLC logical link control
  • SNAP would be overkill for such small message interactions in that SNAP incurs substantial protocol overhead to accommodate different types of network-level protocols.
  • the communication of communal information does not require SNAP or even IP.
  • Communal information may comprise small messages that may be transferred without network layer protocol support.
  • the small messages may comprise, for example, at least one of community identifier information, person identifier information, place description information and service description information.
  • Apparatuses need to be able to convey small messages as soon as they enter the communal environment (e.g., operating space 200 ), and thus, there needs to be a way to avoid using IP when exchanging communal information (e.g., via small messages), even when Wi-Fi technology is being employed.
  • the distribution of communal information via small messages requires an architecture solution that allows “legacy” Wi-Fi for IP-based networking and services to be supported concurrently with small messaging services. Current Wi-Fi architecture does not provide such a platform.
  • FIG. 5 An example of network timing and beaconing usable in accordance with at least one embodiment of the present invention is disclosed in FIG. 5 .
  • the activity flow disclosed at 500 represents an example implementation using selected features of wireless local area networking (WLAN) as set forth in the IEEE 802.11 specification.
  • WLAN wireless local area networking
  • the various embodiments of the present invention are not limited to implementation using WLAN, and thus, may be applied to other wireless network architectures employing different wireless mediums.
  • the WLAN logical architecture comprises stations (STA), wireless access points (AP), independent basic service sets (IBSS), basic service sets (BSS), distribution systems (DS), and extended service sets (ESS). Some of these components map directly to hardware devices, such as stations and wireless access points.
  • wireless APs may function as bridges between stations and a network backbone (e.g., in order to provide network access).
  • An IBSS is a wireless network comprising at least two STAs, and is also sometimes referred to as an ad hoc wireless network.
  • a BSS is a wireless network comprising a wireless access point supporting one or multiple wireless clients, and is also sometimes referred to as an infrastructure wireless network. All STAs in a basic service set may interact via the AP.
  • APs may provide connectivity to wired local area networks and bridging functionality when one STA initiates communication to another STA or with a node that is part of a distribution system (e.g., with a STA coupled to another AP that is linked through a wired network backbone).
  • beacon signals may be utilized to synchronize the operation of networked apparatuses such as disclosed above.
  • the initiating apparatus may establish beaconing based on its own clock, and all apparatuses that subsequently join the network may conform to the beacon.
  • apparatuses joining established networks may synchronize to the network beacon.
  • WLAN apparatuses may synchronize to beacon signals using a timing synchronization function (TSF), which is a local clock function that synchronizes to and tracks the network beacon period.
  • TSF timing synchronization function
  • a target beacon transmission time indicates the targeted beacon transmission. This time may be deemed “targeted” because the actual beacon transmission may be a somewhat delayed from the TBTT due to, for example, the channel being occupied at TBTT.
  • the apparatuses that are active in the network may communicate with each other in accordance with the beacon period. However, there may be instances where it may not be beneficial, and may possibly even be detrimental, for apparatuses to be active during each beacon period. For example, apparatuses that do not expect frequent communication within the wireless network may not benefit from being active for every beacon period. Moreover, apparatuses with limited power or processing resource may be forced to waste these precious resources by the requirement of being active for every beacon period.
  • functionality may be introduced utilizing the example distributed wireless network described above to allow apparatuses to operate at a standard beaconing rate, or alternatively, using a “diluted” beaconing rate.
  • “Diluted” beaconing may entail a beaconing mode operating at a lower frequency than the beaconing rate originally established in the network. Diluted beaconing may be controlled by information (e.g., information elements) that is included in network beacon frames, wherein the included information may express one or more diluted beacon rates as multiples of the beacon.
  • networked apparatuses may elect to operate (e.g., via random contention) based either on the beacon period or a diluted beacon period.
  • TBTT target beacon transmission time
  • apparatuses operating using a diluted beacon period may be active on TBTT counts that corresponds to the multiple defined by the diluted beaconing period.
  • An example diluted beacon rate of every 5 th TBTT is disclosed in FIG. 5 at 504 .
  • the decision on a beaconing rate to utilize may be handled by each apparatus individually, (e.g., in the protocol stacks that manage operation of a radio modem). All apparatuses, however, will operate based on a beacon interval that remains the same for the lifetime of the network.
  • the diluted beacon signal may be expressed as a multiple of the beacon signal.
  • all apparatuses may remain synchronized in a network comprising four apparatuses wherein apparatuses 1 , 2 and 4 operate using a diluted beaconing mode having an example frequency (e.g., a time period between beacon transmissions) of every 6 th TBTT, but only device 3 would be active (e.g., “competing”) in beaconing periods 1 , 2 , 3 , 4 and 5 , while all apparatuses may participate in TBTT 0 , TBTT 6 , TBTT 12 , etc. Therefore, there can be at least two different beacon periods among the apparatuses, and possibly further diluted beacon periods, as each apparatus may select its own diluted beaconing period based on the original beaconing period and the one or more associated diluted beacon period indications transmitted therewith.
  • a diluted beaconing mode having an example frequency (e.g., a time period between beacon transmissions) of every 6 th TBTT, but only device 3 would be active (e.g., “competing”) in beaconing periods 1
  • beacons may contain a diluted beacon period parameter.
  • the diluted beacon period parameter may be carried in a vendor-specific Information Elements (IE) within a beacon packet.
  • IE Information Elements
  • Diluted beacon period parameters remain the same for the lifetime of the network, however should there be need for more flexibility, other beacon rate periods may be predefined, and the predefined beacon rate periods may signaled in a manner similar to the diluted beaconing rate.
  • FIG. 6 discloses an example implementation of “awake windows” in accordance with at least one embodiment of the present invention.
  • a “standard” network beacon e.g., the beacon established by the apparatus that formed the network
  • each target beacon transmit time (TBTT) may represent a beacon frame that is transmitted by an apparatus in the network (or at least times at which beacon transmissions were targeted, barring any delays).
  • TBTT target beacon transmit time
  • the interval shown at 502 may therefore define the standard beacon period.
  • Possible awake windows for an apparatus that is participating in the network are further shown in FIG. 6 , examples of which are identified at 600 and 604 . These active periods occur in accordance with each transmitted TBTT, and therefore, may be deemed aligned with the normal network beacon period. Awake windows do not necessarily represent that an apparatus has planned activity (e.g., messages queued for transmission) during these time periods. On the contrary, they are merely periods of time when apparatuses will be in active, and therefore, will be able to transmit messages to, and/or receive messages from, other apparatuses in the network.
  • planned activity e.g., messages queued for transmission
  • While all apparatuses in the network will operate based on the same origin point (e.g., TSF 0) and normal beacon period (e.g., as set forth by the TBTT), individual apparatuses may select an operational mode based upon the one or more diluted beacon period indications that are transmitted in the beacon. For example, an apparatus may operate utilizing a diluted beacon period which is a multiple “4,” and thus, may be allowed to be active every four TBTTs. Awake windows may also occur in accordance with a diluted beacon period, and in at least one example implementation, the awake windows may began just prior to the commencement of the diluted beacon period.
  • Awake window duration while initially configured to be constant as defined by an IE carried by the beacon, may in actual practice be variable.
  • awake window duration may be defined by a MAC parameter similar to the beacon interval and diluted beacon period parameters.
  • a host in the beaconing apparatus may determine awake window duration and provide it to the modem for transmission in the beacon. It may then be communicated using a general or vendor specific IE along with the beacon interval and diluted beacon period.
  • awake window expiration apparatuses may attempt to transition to a “doze” or sleep state as shown at 602 and 606 . However, the transition to doze state may, in actuality, happen earlier or later in accordance with control methodologies that will be discussed with respect to FIG. 7-8 .
  • An awake window length or duration MAC parameter may determine the final time after which the apparatus may sleep (at least in regard to communal messaging).
  • a radio modem may alter operation locally if it detects certain situations. Examples of situations where a radio modem may alter operation are shown in FIG. 7-8 . For example, if a radio modem in the awake state detects that there are no frames to be received, then the modem may enter the doze state early. In the “SHORTEN AWAKE PERIOD” example of FIG. 7 some message traffic 702 may occur during awake window 700 having an initial awake window duration 704 .
  • the radio modem may realize that no further messages 702 will be received, and may shorten the awake window duration 704 as shown at 706 .
  • the apparatus may enter the doze state more quickly and realize the benefits associated therewith (e.g., power savings).
  • FIG. 7 An example entitled “AWAKE PERIOD CUTOFF PREVENTION” is further disclosed in FIG. 7 . If continuous non-communal (e.g., external, such as from other networks) traffic prevents the modem from transitioning to the doze state the awake window expiration will finally force the modem to go into the doze state. However, if the awake window is scheduled to expire during reception of a communal information frame, then the modem may continue reception of the frame and after completion then enters into the doze state even if there were more frames to be received. This is shown at 710 wherein reception continues of frame 710 even after awake window 700 should have terminated (e.g., as shown by reception continuing after awake window duration cutoff 708 ), but the following communal information packets 712 are not received.
  • continuous non-communal e.g., external, such as from other networks
  • awake window control is not as important because the radio modem may be active for the time required to receive all of the communal information frames.
  • the main purpose for controlling the awake window length parameter in this case is to prevent the communal information traffic from being accidentally cut off by an awake window that is too short.
  • An example of this scenario is disclosed under the heading “AWAKE PERIOD TOO SHORT” in FIG. 8 .
  • awake window 700 has a duration that terminates as shown at 800 .
  • a first message 702 may be received during awake window 700 , but other communal information messages received in the TBTT starting at 802 will not be received.
  • awake window 700 in this example is very short, and thus some power savings may be realized in the apparatus, the negative impact on performance due to the communal information messages starting at 802 not being received may outweigh any benefits.
  • awake window 700 has a length or duration that ends at 804 .
  • the radio modem stays active and is able to receive other network traffic 806 that is not communal information and wastes resources in the apparatus.
  • apparatuses exchanging communal information could execute an adjustment algorithm for modifying awake window duration autonomously without the need for explicit control signaling between apparatuses. Avoiding dedicated control signaling for this purpose may help to conserve power. While automated adjustment may be beneficial, the adjustment must be done accurately. If awake windows do not have the appropriate duration, neighboring nodes may have very different parameter values, which may cause sleep-induced loss (e.g., communal information frames may be lost due to a modem dozing prematurely) because some devices will transmit communal information frames when others have already transitioned into the doze state.
  • sleep-induced loss e.g., communal information frames may be lost due to a modem dozing prematurely
  • Controlling ATIM (Announcement Traffic Indication Message) window duration may be deemed a somewhat similar concept to awake window duration.
  • Current strategies focus only on the adjustment of the ATIM window in such a way that it is long enough for the desired ATIM traffic (coming from own network), without solving the problem of how to react properly to a situation where external traffic dominates the channel.
  • existing systems assume that ATIM window duration is signaled to neighboring apparatuses. In accordance with various embodiments of the present invention, this is a practice that should be avoided to conserve energy in the apparatus.
  • processes for autonomous awake window duration setting is disclosed.
  • the disclosed embodiments may be used in an ad-hoc communal network (referred as “own” network) that competes for resources (e.g., wireless channel access) with other radio systems, also referred as “other” networks, that operate in same wireless bandwidth.
  • Awake time duration or length may be set by measuring own network and other network traffic (e.g., as measured by own network apparatuses) so that if other network traffic becomes dominant in a wireless channel, own network devices may shorten their awake time durations.
  • own network apparatuses may save energy because they avoid receiving other network traffic (e.g., every received other network packet is wasted energy for own network apparatuses).
  • awake window duration may grow. If operating on multiple wireless channels, own network traffic may automatically be moved by awake window adjustments from wireless channels congested by other network traffic to less congested wireless channels, possibly resulting in energy savings and increased communication performance due to less interference.
  • ATIM window control is based on pending traffic that a node is going to send to a counterpart node point-to-point.
  • the various embodiments of the present invention may select awake window length based on at least two categories: own network traffic and other network traffic.
  • ATIM window length is selected so that the pending traffic fits into the window, while in the various embodiments of the present invention the awake window length may be variable in order to accommodate communal information while screening out other network traffic.
  • ATIM window length control is based only on present traffic, while in the various embodiments of the present invention adjustment may be based on predicted future traffic situations.
  • ATIM window length is signaled to a counterpart node, while in various embodiments of the present invention awake window duration is controlled autonomously at each node, which helps to save power.
  • a channel utilization measure (û) corresponding to transmitted and received network traffic/awake time, or to another similar channel congestion measure, may be utilized to predict own network traffic and other network traffic.
  • Utilization û may be formulated by a radio modem supporting communal messaging, or it may be calculated in upper layers of the apparatus communication system based on received packets and information obtained about measured awake time.
  • Utilization û can be instantaneous per awake-period or buffered previous utilizations from where average, median or moving average may be calculated.
  • Instant channel utilizations u k , u k+1 , . . . , u k+n may collected to a buffer vector of size n, and when the buffer is full:
  • awakeTime Time the modem was awake per awake window
  • û other other Received other networks' traffic per awake time
  • û own Transmitted and received own networks' traffic per awake time
  • Dominance_Threshold_other Threshold that determines others' dominance, for example 50%
  • Dominance_Threshold_own Threshold that determines own dominance, for example 50%
  • w step Amount of decrease in awake window length when shortened
  • v step Amount of increase in awake window length when grown
  • CurrentAwakeWindowLength Length of awake window now
  • MaxAwakeWindowLength Widest possible awake window
  • MinAwakeWindowLength Shortest possible awake window
  • NextAwakeWindowLength Result of the algorithm.
  • two example pseudocodes that help explain how awake window duration may be adjusted comprise:
  • awake window length control algorithms instead of having a fixed awake window length is that a system (e.g., communal information distribution system) may operate in an always-on fashion while still having reasonable power consumption. Moreover, scalability may be introduced into power consumption in that that power consumption for each apparatus in a community may be controlled locally regardless of the community size (e.g., the same algorithm may be used regardless of community size since the control is localized and inter-apparatus notification is not required).
  • awake window duration control may be implemented with no changes in the radio modem, and if needed, may instead be implemented in the host (e.g., control layers in the apparatus). In multi-channel operation, awake window duration may be different for each wireless channel, allowing traffic to be directed to non-congested channels if necessary.
  • FIG. 9A-9C disclose simulation results based on an operational scenario including 200 apparatuses in a community randomly distributed over 400 m ⁇ 50 m area.
  • Different devices executed different operations, like searching members of the community (multi-hop), exchanging context information (single hop), publishing of profile information (multi-hop), group chat using community messaging (multi-hop) and matching of interest tags (multi-hop).
  • multi-hop searching members of the community
  • multi-hop exchanging context information
  • multi-hop single hop
  • multi-hop multi-hop
  • multi-hop multi-hop
  • Other network traffic is presented as offered load over the whole simulation area. Two different cases are presented: Static awake window operation, where awake window duration is a fixed value; and Dynamic awake window operation, where awake window duration is dynamically adjusted.
  • FIG. 9A discloses an example effect of awake window duration adjustment on reply success (e.g., the percent of responses to different queries reached back the queried device).
  • the reply loss appears to increase slightly.
  • FIG. 9B discloses an example effect of awake window duration adjustment on reply times. The time-per-hop appears to increase slightly when awake window duration adjustment is used.
  • FIG. 9C discloses an example effect of awake window duration adjustment on power consumption. When the amount of other network traffic grows the system using awake window duration adjustment appears to put the radio modem into the doze state earlier, resulting in fewer other network frames being received and substantially lower power consumption.
  • FIG. 10A an example flowchart of a communication process is disclosed in FIG. 10A .
  • the process may initiate in step 1000 , which is followed by step 1002 wherein first information (e.g., other network traffic expected on a wireless channel) may be received in an apparatus.
  • a determination may then be made in step 1004 as to whether the first information (e.g., the expected other network traffic information) satisfies a first criterion (e.g., will exceed the other network's dominance threshold (DT) value).
  • DT dominance threshold
  • the other network dominance threshold may be set in the apparatus as a fixed value or may be a dynamic value that may be updated by the apparatus periodically based, for example, on average other network traffic on the wireless channel, based on changes sensed in wireless channel traffic, etc. If it is determined in step 1004 that the expected other network channel traffic exceeds the other network DT, the process may proceed to step 1006 wherein the awake window duration may be shortened (e.g., to avoid receiving other network messages and conserve apparatus power), but not below an awake window minimum value set in the apparatus. The process may then be complete in step 1008 and may return to step 1000 in preparation for the next reception of other network traffic information in step 1002 .
  • step 1004 it is determined that the expected other network traffic will not exceed the other network DT, a further determination may be made in step 1010 as to whether second information (e.g., expected own network traffic on the wireless channel, such as traffic from a network in which the apparatus is participating) will satisfy a second criterion (e.g., will exceed an own network DT). Own network information may be received in the apparatus from other apparatuses in the own network (e.g., via communal messaging) or may already be present in the apparatus based on the participation of the apparatus in the own network.
  • second information e.g., expected own network traffic on the wireless channel, such as traffic from a network in which the apparatus is participating
  • Own network information may be received in the apparatus from other apparatuses in the own network (e.g., via communal messaging) or may already be present in the apparatus based on the participation of the apparatus in the own network.
  • the own network DT may be set in the apparatus as fixed or dynamic value that may be updated by the apparatus periodically based on, for example, average own network traffic on the wireless channel, sensed changes in own network traffic on the wireless channel or in the apparatus itself due to, for example, the activation of a particular application on the apparatus (e.g., a chat application), a power condition in the apparatus, etc. If in step 1010 it is determined that expected own network traffic will exceed the own network DT, the process may then move to step 1012 where the awake window duration may be lengthened (e.g., in order to provide more time for own network operation), but not above a maximum value set in the apparatus. The process may then terminate in step 1008 and reinitiate in step 1000 .
  • step 1010 If in step 1010 it is determined that predicted own network traffic will not exceed the own network DT, the process may move to step 1014 where the awake window duration may be maintained (e.g., not changed from previous length). The process may then terminate in step 1008 and reinitiate in step 1000 .
  • FIG. 10B An alternative example communication process, in accordance with at least one embodiment of the present invention, is disclosed in FIG. 10B .
  • the process may initiate in step 1016 and may receive other network traffic information expected for a wireless channel similar to the process of FIG. 10A .
  • a determination may be made as to whether the first information (e.g., expected other network traffic on the wireless channel) satisfies a different first criterion (e.g., a previous value for expected other network traffic on the wireless channel).
  • the previous value for the other network traffic information may be the last set of other network traffic information received by the apparatus.
  • step 1020 If in step 1020 it is determined that the expected other network traffic information exceeds the previous other network traffic information (e.g., other network traffic appears to be increasing), the process may move to step 1022 wherein the awake window duration may be shortened to avoid receiving other network traffic (e.g., to save power). Similar to FIG. 10A , a minimum value set in the apparatus may prevent the awake window duration from becoming too short. The process may then terminate in step 1024 and may return to step 1016 in preparation for the next reception of other network traffic information in step 1018 .
  • the process may move to step 1022 wherein the awake window duration may be shortened to avoid receiving other network traffic (e.g., to save power). Similar to FIG. 10A , a minimum value set in the apparatus may prevent the awake window duration from becoming too short.
  • the process may then terminate in step 1024 and may return to step 1016 in preparation for the next reception of other network traffic information in step 1018 .
  • step 1020 If in step 1020 a determination is made that the first information does not satisfy the first criterion, the process may proceed to step 1026 wherein a further determination may be made as to whether second information (e.g., own network traffic expected on the wireless channel) satisfies a second criterion (exceeds previous own network traffic information). If it is determined in step 1026 that the expected own network traffic information exceeds the previous own network traffic information (e.g., own network traffic appears to be increasing), the process may move to step 1028 wherein the awake window duration may be lengthened (e.g., in order to avoid packet losses due to awake window cutoff). Similar to FIG. 10A , a maximum value set in the apparatus may prevent the awake window duration from becoming too long.
  • second information e.g., own network traffic expected on the wireless channel
  • step 1026 it is determined that the second information does not satisfy the second criterion (e.g. the expected own network traffic does not exceed the previous own network traffic)
  • the process may move to step 1030 wherein the awake window duration may be maintained (e.g., awake window duration is not altered).
  • the process may then be complete in step 1024 and may reinitiate in step 1016 .
  • an apparatus in accordance with at least one embodiment of the present invention, may comprise means for receiving information pertaining to wireless traffic expected from other networks utilizing a wireless channel on which the apparatus is configured to communicate, means for determining whether the first information satisfies a first criterion, means for, if the first information is determined to satisfy the first criterion, shortening an awake window duration for communicating on the wireless channel, means for, if the first information is determined not to satisfy the first criterion, determining whether second information satisfies a second criterion, the second information pertaining to wireless traffic on the wireless channel that is expected from a network in which the apparatus is participating, and means for if the second information is determined to satisfy the second criterion, lengthening the awake window duration for communicating on the wireless channel.
  • At least one other example embodiment of the present invention may include electronic signals that cause an apparatus receive information pertaining to wireless traffic expected from other networks utilizing a wireless channel on which the apparatus is configured to communicate, determine whether the information satisfies a first criterion, if the information is determined to satisfy the first criterion, shorten an awake window duration for communicating on the wireless channel, if the first information is determined not to satisfy the first criterion, determine whether second information satisfies a second criterion, the second information pertaining to wireless traffic on the wireless channel that is expected from a network in which the apparatus is participating, and if the second information is determined to satisfy the second criterion, lengthen the awake window duration for communicating on the wireless channel.

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EP2582188A3 (de) 2013-07-24
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